Caspar David Friedrich (1774-1840) is heralded as the greatest painter of the Romantic movement in Germany, and Europe's first truly modern artist. His mysterious and melancholy landscapes, often peopled with lonely wanderers, are experiments in a radically subjective artistic perspective--one in which, as Freidrich wrote, the painter depicts not "what he sees before him, but what he sees within him." This vulnerability of the individual when confronted...